Sensor-driven audio playback modification

ABSTRACT

Sensor data generated by one or more sensors associated with a digital content playback device can be used to identify that a modification to a current audio content item being supplied to a user by the digital content playback device is indicated. The current audio content item can be modified accordingly. Methods, systems, articles of manufacture and the like are also described.

CROSS-REFERENCE TO RELATED APPLICATION

The current application is claims priority under 35 U.S.C. §119(e) toU.S. provisional application No. 61/821,104 filed on May 8, 2013, thedisclosure of which is incorporated herein by reference.

TECHNICAL FIELD

The subject matter described herein relates to playback of audio mediawith one or more modifications that can be prompted by data provided byone or more sensors.

BACKGROUND

Music can be an important part of an exercise or other physical activityroutine for many people. For example, runners, weight lifters,participants in aerobic exercises, users of cardiovascular exercisemachines (e.g. stair steppers, stationary bicycles, elliptical motionmachines, and the like), etc. frequently listen to music whileparticipating in such activities. Music can help alleviate boredom, anda particularly motivational or inspirational song or group of songs canbe helpful in maintaining focus and improving performance. However,while a user can assemble a group of songs (also referred to as aplaylist or “mix”) using one or more sources such as a personal musiccollection, an online music streaming service, or the like, suchplaylists generally lack the ability to react to the specifics of thephysical activities that the user is performing at any given time.

SUMMARY

To address the above-noted and possibly other deficiencies in currentlyavailable approaches, and also to provide one or more advantagesincluding but not limited to those contemplated herein, implementationsof the current subject matter can include features that incorporate useof input data from one or more sensors that measure one or moreparameters representative of a current state of physical activity of auser to dynamically modify one or more aspects of playback of music orother audio content item to which the user is listening. Non-limitingexamples of a system that can implement an implementation of the currentsubject matter include smart phones or other portable electronic devicesthat either include or receive data from (e.g. over wired or wirelesscommunications links) one or more sensors, which can include but are notlimited to, global positioning system (GPS) transceivers or otherlocation determination devices, accelerometers, gyroscopes, compasses,heart-rate monitoring devices, calorie-consumption monitoring devices,or the like.

In one aspect of the current subject matter, a method includes receivingsensor data generated by one or more sensors, identifying that amodification to an audio content item being supplied to a user by adigital content playback device is indicated, and making themodification to the audio content item. The identifying includesapplying an algorithm based on the sensor data.

In optional variations, one or more of the following features can beincluded in any feasible combination. The modification can includechanging from the current audio content item to a different audiocontent item. The different audio content item can have a differentintensity criteria than the current audio content item. The differentintensity criteria can include at least one of a different beats perminute, a different intensity level, and a different motivational level.The modification can include continuing to play the current audiocontent item, and changing from a current beats per minute of thecurrent audio content item to a different beats per minute by speedingup or slowing down the current beats per minute. The one or more sensorscan include at least one of a global positioning system (GPS)transceiver; a location determination device, an accelerometer sensor, agyroscope, a compass, a heart-rate monitoring device, and acalorie-consumption monitoring device. Alternatively, the one or moresensors can include two or more of the options listed, such as forexample an accelerometer and a heart rate monitor. The algorithm caninclude determining a distance traveled by the user over a measurementinterval based on data from the one or more sensors, which can includean accelerometer sensor. The measurement interval can be sufficientlyshort to capture no more than a single step. The algorithm can alsoinclude incrementing a step counter if the distance traveled exceeds athreshold distance for classifying as the distance traveled as a step,and determining a target beats per minute to which the current audiocontent item should be modified or maintained based on a duration ofuser movement and the step counter for a current aggregation interval.The current aggregation interval can aggregate values from a pluralityof measurement intervals including the measurement interval.

Implementations of the current subject matter can include, but are notlimited to, methods consistent with the descriptions provided herein aswell as articles that comprise a tangibly embodied machine-readablemedium operable to cause one or more machines (e.g., computers, etc.) toresult in operations implementing one or more of the described features.Similarly, computer systems are also described that may include computerhardware such as one or more processors and one or more memories coupledto the one or more processors. A memory, which can include acomputer-readable storage medium, may include, encode, store, or thelike one or more programs that cause one or more processors to performone or more of the operations described herein. Computer implementedmethods consistent with one or more implementations of the currentsubject matter can be implemented by one or more data processorsresiding in a single computing system or multiple computing systems.Such multiple computing systems can be connected and can exchange dataand/or commands or other instructions or the like via one or moreconnections, including but not limited to a connection over a network(e.g. the Internet, a wireless wide area network, a local area network,a wide area network, a wired network, or the like), via a directconnection between one or more of the multiple computing systems, etc.

The details of one or more variations of the subject matter describedherein are set forth in the accompanying drawings and the descriptionbelow. Other features and advantages of the subject matter describedherein will be apparent from the description and drawings, and from theclaims. The claims that follow this disclosure are intended to definethe scope of the protected subject matter.

DESCRIPTION OF DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of this specification, show certain aspects of the subject matterdisclosed herein and, together with the description, help explain someof the principles associated with the disclosed implementations. In thedrawings,

FIG. 1 shows a diagram illustrating aspects of a system showing featuresconsistent with implementations of the current subject matter;

FIG. 2 shows a process flow diagram illustrating aspects of a methodhaving one or more features consistent with implementations of thecurrent subject matter;

FIG. 3 shows a table listing examples of threshold distance and maximumsteps per minute scaling factors consistent with implementations of thecurrent subject matter; and

FIG. 4 shows a process flow diagram illustrating aspects of a methodhaving one or more features consistent with implementations of thecurrent subject matter.

When practical, similar reference numbers denote similar structures,features, or elements.

DETAILED DESCRIPTION

Use of portable devices for playback of digital audio content has becomeincreasingly common. In addition to dedicated devices, such as forexample early generation versions of the iPod™ available from AppleComputer, Inc., cellular phones, smart phones, tablet computing devices,and the like are almost ubiquitous. Such devices, which are referred toherein as digital content playback devices, are generally capable ofplaying digital audio content that is stored on a data storage device(such as for example flash memory, a magnetic hard drive, optical media,etc.), which can optionally be internal to the digital content playbackdevice 102. In addition, many currently available digital contentplayback devices of this type are also capable of streaming music overnetwork connection from a server computer. Such a network connection canoptionally include one or more of the Internet, a wide area wirelessnetwork (e.g. a cellular service network), a local area wireless network(e.g. a WiFi connection based on one or more 802.11 protocols), or otherradio or optical communication links (e.g. Bluetooth, infrared, etc.).For the purposes of this disclosure, the term audio content item refersgenerally to a music file, other digital audio content, etc. that thedigital content playback device 102 processes to produce audibleplayback of the included content to a user of the digital contentplayback device 102.

FIG. 1 shows a diagram 100 illustrating features that can be present ina system or systems capable of providing one or more features consistentwith implementations of the current subject matter. A digital contentplayback device 102 can include at least one programmable processor 104as well as at least one data storage device 106, which can include anykind of data storage device, including but not limited to thosementioned above. The digital content playback device 102 can alsoinclude at least one network transceiver 110 via which the digitalcontent playback device 102 can communicate over a network 112 with amedia server 114. The network 112 can include any of the optionsdiscussed above or their functional equivalents in any feasiblecombination, and the network transceiver 110 can include one or more ofa WiFi transceiver, a cellular transceiver, or the like for sending andreceiving data in communication with the media server 114 over thenetwork 112.

The media server 112 can be implemented on one or more programmablemachines that include one or more processors. In some examples, themedia server 112 can include a “cloud” based music service. In otherexamples, the media server 112 can include a networked machine situatedwithin a smaller-scale network, such as for example a home or commercialnetwork. Consistent with other implementations of the current subjectmatter, audio content played by the digital content playback device 102can be stored locally at the digital content playback device 102, forexample in the data storage device 106 or other storage or memoryinternal to or associated with the digital content playback device 102.For example, a digital content playback device 102 having a hard drive,flash storage, random access memory, read-only memory, SD card, or thelike that locally stores audio content can use that locally stored audiocontent for playback consistent with one or more of the approachesdiscussed herein.

The digital content playback device 102 can optionally include one ormore internal sensors 116, and can in some implementations of thecurrent subject matter receive input data from one or more externalssensors 120. The internal sensors and external sensors can include oneor more of global positioning system (GPS) transceivers or otherlocation determination devices, accelerometers, gyroscopes, compasses,heart-rate monitoring devices, calorie-consumption monitoring devices,or the like. In an example, internal sensors 116 can include a GPStransceiver, an accelerometer or accelerometer sensor, a gyroscope orgyroscopic sensor, and a compass, and external sensors 120 can includeone or both of a heart rate sensor and a calorie consumption device. Asused herein, an accelerometer sensor refers to a device that measuresmovement and gravity, as well as an angle of orientation. The internalsensors 116 can communicate with the programmable processor 104 over aninternal communication bus of the digital content playback device 102 orvia any feasible connections. External sensors 120 can communicate withthe programmable processor 104 over a communication path than caninclude a Bluetooth connection, an infrared connection, an RFIDconnection, some other kind of wireless communication link, a wiredconnection, or the like. The term “sensors” is used throughout thereminder of this disclosure to refer interchangeably to internal sensors116 and external sensors 120 unless a contrary usage is explicitlyindicated. The programmable processor 104 can execute an audio contentmodification module or program (referred to herein as a decision makingmodule or DMM), which can optionally be an “app,” a web application(e.g. application software that runs in a web browser or is created in abrowser-supported programming language, such as one or more ofJavaScript, HTML, CSS, etc., and that relies on a common web browser torender the application), a native application (e.g. an applicationprogram that has been developed for use on a particular platform ordevice), or the like. The digital content playback device 102 can alsoinclude a display device (e.g. a screen) for displaying information tothe user and one or more input devices (e.g. a touch screen, a stylus,one or more buttons or keys, a touch or mechanical keyboard, etc.) forreceiving input from the user.

While a user is receiving (e.g. listening to playback of) an audiocontent item supplied by the digital content playback device 102 andusing the DMM, the data received from the sensors (“sensor data”) can bestored in the data storage device 106 and thereby retained on thedigital content playback device 102 for later analysis. Optionally, thesensor data can be transmitted to a networked storage. In some examples,data transmitted to a networked storage is anonymized or alternativelystored in a secure manner to maintain privacy of the user. The storedsensor data can be stored at some storage or analysis interval that isuseful for making determinations of actions to be taken in response to aphysical or physiological state of the user, a level of activity of theuser, etc. For example, a sensor data storage interval can optionally beone second, 5 seconds, 10 seconds, etc. When the sensor data aregenerated at a finer time interval than the storage or analysisinterval, the data can be aggregated in some manner, for example byaveraging over the longer storage or analysis interval, etc.

Periodically, the retained sensor data can be analyzed to estimate acurrent level of physical performance of the user and to determine ifsome change in the supplied audio content is indicated. While not anexhaustive list, examples of actions that can be taken to cause a changein the supplied audio content can include one or more of changing anumber of beats per minute (BPM) of musical audio content beingsupplied, inserting a motivational additional audio track that overlaysthe currently supplied audio content item (e.g. a “voice-over” readingan inspirational or motivational statement, quotation, or the like),skipping to a higher or lower intensity part of a group of songs orwithin a continuous “mix” of songs, etc. A higher or lower intensitysong or other audio content item can include a higher or lower beats perminute, or alternatively can meet other criteria or classifying featuresrelating to higher of lower intensity, or more or less motivational,etc. Such criteria can be pre-defined (e.g. stored in a library or otherdatabase based on settings defined globally) for individual audiocontent items or groups of audio content items. Alternatively or inaddition, criteria can be defined or modified for content items orgroups of content items based on user input, which can be received via auser interface on the digital content playback device 102, via a webinterface (e.g. using a browser on another device, such as a computer atablet, etc. or on the digital content playback device 102 itself), orby any other approach.

The number of BPM of a currently playing audio content item can bedynamically changed, either by gradually increasing or decreasing theBPM within an audio content item (e.g. by “speeding it up” or “slowingit down”). Alternatively, the BPM can be changed by transitioning to adifferent song or track (e.g. a different audio content item) with adifferent BPM, etc. The change can (but is not required to) be gradualsuch that the BPM is not changed suddenly or too frequently, and onlyafter it is determined that the user has altered his or her pace for areasonable and configurable amount of time. The change in BPM is alsoadvantageously completed neither too quickly nor too slowly, and iscompleted to as closely as possibly synchronize with intended actions ofthe user. Adjustments to the BPM of audio content being played for theuser can be

One measure of a running or walking user's pace, which can be usedconsistent with some implementations of the current subject matter, is acalculation of a number of steps per minute. This calculation can bebased on data received from an accelerometer sensor, for example onethat is internal to or otherwise in communication with the digitalcontent playback device 102. FIG. 2 shows a process flow chart 200illustrating features consistent with a representative (butnon-limiting) approach to such a calculation. At 202 data are receivedfrom the accelerometer sensor for a measurement interval, which canoptionally be fixed. The measurement interval can in one example be in arange of 5 to 50 milliseconds, or optionally approximately 10milliseconds. In general, the measurement interval is chose to besufficiently short such that no more than a single step can occur duringthe measurement interval. The receiving can optionally occur in responseto a periodic querying (e.g. pinging or otherwise contacting) of theaccelerometer sensor by a programmable processor 104 of the digitalcontent playback device 102.

At 204, a distance between a current point and a last point isdetermined based on the accelerometer data. For example, theaccelerometer sensor can return a distance moved over the measurementinterval in 202. The distance moved is compared to a threshold distanceat 206 to determine if the distance moved was sufficient for beingclassified as a step occurring during the measurement interval. Thethreshold distance can be a customizable, scalar setpoint that can beentered manually or determined by the digital content playback device102 for a user of the digital content playback device 102. The comparingof the distance moved to the threshold distance can be accomplished insome examples by calculating the dot product of the distance movedvector with itself and comparing this dot product to a scalar thresholdvalue. At 210, a step counter is incremented by one to indicate that astep has occurred if the distance moved exceeds the threshold distance.At 212, a maximum steps per minute can be applied to cap the value ofthe step counter to mitigate potential effects of noisy data. Forexample, the maximum value can be set at some number of steps per minutethat no human could reasonably exceed.

To convert steps per minute into a target beats per minute value for theaudio content playback, an additional calculation can be performed todetermine at 214 whether the user is actually moving in a mannerconsistent with walking or running. In one example, two parallel tables(e.g. a primary table and a secondary table) can be created. Each of theparallel tables can track one or more of time intervals, the number oftotal steps taken since a start of data recording and a number of stepstaken in a last defined aggregation interval (e.g. a 5 secondaggregation interval or a defined time aggregation interval of anotherlength). The primary and secondary tables can be used to enhance theuser experience by ensuring that changes in the audio content playbackis not improperly influenced by temporary stops in movement. In otherwords, by use of two tables, skewing of the beats per minutecalculations as a result of pauses in movement (which can negativelyimpact the user experience) can be avoided.

If the number of steps taken in the most recent aggregation interval isbelow a cadence threshold, the secondary table does not increment. Thecadence threshold can be defined as a minimum number of steps requiredto establish that the user is actually running or walking (e.g. resting,stopped at an intersection, performing other activities, etc.). If thenumber of steps taken in the most recent aggregation interval is at orabove the cadence threshold, the secondary table is incremented. Thefirst table increments for each aggregation interval. Because the secondtable only increments if the cadence threshold is exceeded, the firsttable is used for the current steps per minute unless the number ofsteps for the aggregation interval is below the cadence threshold. Whenthat condition occurs, the previous, unincremented value in the secondtable is used as the current steps per minute.

At 216, a target beats per minute is determined based on a duration overwhich the user is determined to have been moving and the number of stepsper minute in a current aggregation interval and/or at least one prioraggregation interval. In an illustrative but non-limiting example, ifthe time interval indicates the user has been moving for less than aminute, the target beats per minute is the number of steps taken in theinterval multiplied by the duration of the time interval (in seconds)divided by 60 seconds in a minute. If the user has been moving for morethan a minute, the target beats per minute is the number of total stepstaken in the current aggregation interval subtracted from the number oftotal steps taken at a prior aggregation interval some period of timeprior to the current interval (e.g. 60 seconds or 12 intervals prior fora 5 second interval). Both calculations can be bounded by upper andlower caps as defined by user input, by one or more predefined values(e.g. defined within the DMM app, etc.), or the like.

Values for the threshold distance and the maximum steps per minute canoptionally be set initially based on the user's indication of where thedigital content playback device 102 is held during exercise. Forexample, if the digital content playback device 102 is held in theuser's pocket, the threshold distance can be in a range of approximately0.68 to 0.72, or optionally approximately 0.70, and the maximum stepsper minute can be in a range of approximately 3.2 to 3.4 or optionallyapproximately 3.3. If the digital content playback device 102 is held inthe user's hand, the threshold distance can be in a range ofapproximately 0.76 to 0.80, or optionally approximately 0.78, and themaximum steps per minute can be in a range of approximately 3.4 to 3.6,or optionally approximately 3.5. If the digital content playback device102 is secured on or otherwise attached to an armband worn by the user,the threshold distance can be in a range of approximately 0.84 to 0.88,or optionally approximately 0.86, and the maximum steps per minute canbe in a range of approximately 3.4 to 3.6, or optionally approximately3.5.

The threshold distance and the maximum steps per minute can optionallyalso or alternatively be abstracted into a “sensitivity” setting that iscapable of altering these values using scaling factors, such as forexample on a range of 1 to 10. The scaling factors to be used can bedetermined based on user input, some automated calibration process, orthe like. For example, the DMM can direct the user of the digitalcontent playback device 102 to take a prescribed number of steps or toperform some other set of movements and can measure accelerometer sensorresponses as the user performs the directed activities. Based on theaccelerometer sensor responses, appropriate scaling factors for the usercan be determined. In an example of a scaling range of 1 to 10, FIG. 3shows a table 300 listing possible scaling factors that can be used forthe threshold distance and maximum steps per minute.

Using a collection of historical sensor data for the user and historicaluser responses to previous modifications in the supplied audio contentthat can be accumulated over multiple instances of physical activitywhile using features described herein, response parameters for how thesupplied audio content is changed in response to sensor data can beadapted to provide improved motivational value relative to thehistorical impact of such changes on the user's actions. For example, adefault parameter for changing the BPM of the supplied audio content canbe to cause a 5% increase in BPM if the user is detected to have fallenoff of a target pace by 5%. However, if the historical sensor data andhistorical user responses to previous modifications in the suppliedaudio content so indicate, a greater or smaller change in the BPM can besupplied. In this manner, the DMM can not only make changes in thesupplied audio content to improve the motivational value of the suppliedaudio content but can also “learn” the types and magnitude of suchchanges that can provide the greatest motivational value for a givenuser. In addition to being able to learn by analyzing changes in thesupplied audio content and the effects of such changes on userperformance, the DMM can also receive direct user input via the userinput device 124. For example, the user can indicate that a given songor group of songs was motivational or that an executed change in the BPMor other modification of the supplied audio content was helpful or not(or more or less helpful based on some scale), etc. Historical data canalso be used in conjunction with a specific song or mix or playlist ofsongs. For example, if there is a history of one or more BPM increasesor decreases or perceived user actions or received user inputs for aspecific song or mix or playlist of songs, a pattern recognition modulecan identify similar sensor data in a later use of the digital contentplayback device 102 and can seek to duplicate the one or more actions.

Changes to the BPM can optionally be as a percentage of the current BPMor as some absolute increase or decrease, and can be continuous orstepwise. Similarly, the DMM can include functionality for requestingthat a user input one or more goals for a physical activity session(e.g. via the display device 122 and input device 124) and can use thesegoals as inputs for deciding how to modify the supplied audio content.For example, if the user goal is to run a half marathon in less than 2hours, a projected desired pace can be determined, and the BPM can bechanged or other actions taken to modify the supplied audio content ifthe sensor data indicate that the user is moving too fast or too slowrelative to the desired pace. Using additional sensor data, such as forexample GPS data in conjunction with mapping data, accelerometer data,heart rate data, etc. the modifications to the supplied audio contentcan be further refined to account for a current user situation. Forexample, if the user is currently climbing a hill and dropping below thetarget pace (optionally by some tolerance amount) the BPM can beincreased to provide additional motivation. However, if the heart ratedata indicates that the user may be laboring (e.g. an excessively highheart rate), the BPM can be slowed to better reflect the currentpossible pace.

Supplied audio content can be catalogued according to one or morefactors or rankings reflecting a motivational value of the content or anintensity value of the content. The rankings or cataloguing can reflectone or more of results from sensor data relative to user outcomes (e.g.by aggregating anonymized data from multiple users, possibly at acentral server receiving such data from a number of digital contentplayback devices 102 used by different users), based on user input (e.g.“please rank this content on a scale), based on one or more measurableaspects of the content (e.g. motivational lyrics, musical features suchas building to a crescendo, etc.), or the like.

FIG. 4 shows a process flow chart 400 illustrating features of a methodconsistent with an implementation of the current subject matter. One ormore of these features can be included in other implementations. At 402,sensor data generated by one or more sensors is received by aprogrammable processor 104. In an advantageous implementation, theprogrammable processor 104 is part of a digital content playback device102, such as for example a smart phone, etc. Alternatively, theprogrammable processor can be part of a server or other remote computerthat receives the sensor data over a network.

The sensor data can be representative of one or more of a location, aspeed, an angle of incline etc. of the digital content playback device102, and by extension, of a user of the digital content playback device102. In addition or alternatively, the sensor data can be representativeof one or more physiological parameters (e.g. a heart rate, a calorieburn rate, a blood pressure, a body temperature, a brain activity level,etc.) of the user. At 404, an algorithm is applied based on sensor datafrom at least a current analysis period to identify that a modificationto audio content being supplied to the user by the digital contentplayback device 102 is indicated. As discussed above, the modificationcan be indicated for a variety of reasons, which can generically bereferred to as factors indicative of a current level of performance of aphysical activity by the user that is outside of a preferred set ofparameters. At 406, the sensor data from the current analysis period canalso be stored on a data storage device 106, which can be included onthe digital content playback device 102 or accessed over a network. At410, the modification is made to the supplied audio content in responseto the indication. The modification can include one or more factors asdiscussed above.

One or more aspects or features of the subject matter described hereincan be realized in digital electronic circuitry, integrated circuitry,specially designed application specific integrated circuits (ASICs),field programmable gate arrays (FPGAs) computer hardware, firmware,software, and/or combinations thereof. These various aspects or featurescan include implementation in one or more computer programs that areexecutable and/or interpretable on a programmable system including atleast one programmable processor, which can be special or generalpurpose, coupled to receive data and instructions from, and to transmitdata and instructions to, a storage system, at least one input device,and at least one output device. The programmable system or computingsystem may include clients and servers. A client and server aregenerally remote from each other and typically interact through acommunication network. The relationship of client and server arises byvirtue of computer programs running on the respective computers andhaving a client-server relationship to each other.

These computer programs, which can also be referred to programs,software, software applications, applications, components, or code,include machine instructions for a programmable processor, and can beimplemented in a high-level procedural language, an object-orientedprogramming language, a functional programming language, a logicalprogramming language, and/or in assembly/machine language. As usedherein, the term “machine-readable medium” refers to any computerprogram product, apparatus and/or device, such as for example magneticdiscs, optical disks, memory, and Programmable Logic Devices (PLDs),used to provide machine instructions and/or data to a programmableprocessor, including a machine-readable medium that receives machineinstructions as a machine-readable signal. The term “machine-readablesignal” refers to any signal used to provide machine instructions and/ordata to a programmable processor. The machine-readable medium can storesuch machine instructions non-transitorily, such as for example as woulda non-transient solid-state memory or a magnetic hard drive or anyequivalent storage medium. The machine-readable medium can alternativelyor additionally store such machine instructions in a transient manner,such as for example as would a processor cache or other random accessmemory associated with one or more physical processor cores.

Further to the description above, to provide for interaction with auser, one or more aspects or features of the subject matter describedherein can be implemented on a computing device (e.g. a digital contentplayback device 102) having a display device 122, such as for example acathode ray tube (CRT) or a liquid crystal display (LCD) or a lightemitting diode (LED) monitor for displaying information to the user anda keyboard and a pointing device, such as for example a mouse or atrackball, by which the user may provide input to the digital contentplayback device 102. Other kinds of devices can be used to provide forinteraction with a user as well. For example, feedback provided to theuser can be any form of sensory feedback, such as for example visualfeedback, auditory feedback, or tactile feedback; and input from theuser may be received in any form, including, but not limited to,acoustic, speech, or tactile input. Possible input devices 124 include,but are not limited to, touch screens or other touch-sensitive devicessuch as single or multi-point resistive or capacitive trackpads, voicerecognition hardware and software, optical scanners, optical pointers,digital image capture devices and associated interpretation software,and the like.

The subject matter described herein can be embodied in systems,apparatus, methods, and/or articles depending on the desiredconfiguration. The implementations set forth in the foregoingdescription do not represent all implementations consistent with thesubject matter described herein. Instead, they are merely some examplesconsistent with aspects related to the described subject matter.Although a few variations have been described in detail above, othermodifications or additions are possible. In particular, further featuresand/or variations can be provided in addition to those set forth herein.For example, the implementations described above can be directed tovarious combinations and subcombinations of the disclosed featuresand/or combinations and subcombinations of several further featuresdisclosed above. In addition, the logic flows depicted in theaccompanying figures and/or described herein do not necessarily requirethe particular order shown, or sequential order, to achieve desirableresults.

In the descriptions above and in the claims, phrases such as “at leastone of” or “one or more of” may occur followed by a conjunctive list ofelements or features. The term “and/or” may also occur in a list of twoor more elements or features. Unless otherwise implicitly or explicitlycontradicted by the context in which it used, such a phrase is intendedto mean any of the listed elements or features individually or any ofthe recited elements or features in combination with any of the otherrecited elements or features. For example, the phrases “at least one ofA and B;” “one or more of A and B;” and “A and/or B” are each intendedto mean “A alone, B alone, or A and B together.” A similarinterpretation is also intended for lists including three or more items.For example, the phrases “at least one of A, B, and C;” “one or more ofA, B, and C;” and “A, B, and/or C” are each intended to mean “A alone, Balone, C alone, A and B together, A and C together, B and C together, orA and B and C together.”

Use of the term “based on,” above and in the claims is intended to mean,“based at least in part on,” such that an unrecited feature or elementis also permissible.

The scope of the following claims may include other implementations orembodiments.

What is claimed is:
 1. A method comprising: receiving sensor datagenerated by one or more sensors, the sensor data relating to a user ofa digital content playback device; identifying that a modification to acurrent audio content item being supplied to the user by the digitalcontent playback device is indicated; the identifying comprisingapplying an algorithm based on the sensor data; and making themodification to the current audio content item, wherein the algorithmcomprises: determining a distance traveled by the user over ameasurement interval based on data from the one or more sensors, themeasurement interval being sufficiently short to capture no more than asingle step; incrementing a step counter if the distance traveledexceeds a threshold distance for classifying as the distance traveled asa step; and determining a target beats per minute to which the currentaudio content item should be modified or maintained based on a durationof user movement and the step counter for a current aggregationinterval, the current aggregation interval aggregating values from aplurality of measurement intervals including the measurement interval.2. A method as in claim 1, wherein the modification comprises changingfrom the current audio content item to a different audio content item,the different audio content item having a different intensity criteriathan the current audio content item.
 3. A method as in claim 2, whereinthe different intensity criteria comprises at least one of a differentbeats per minute, a different intensity level, and a differentmotivational level.
 4. A method as in claim 1, wherein the modificationcomprises: continuing to play the current audio content item; andchanging from a current beats per minute of the current audio contentitem to a different beats per minute by speeding up or slowing down thecurrent beats per minute.
 5. A method as in claim 1, wherein the one ormore sensors comprise at least one of a global positioning system (GPS)transceiver; a location determination device, an accelerometer sensor, agyroscope, a compass, a heart-rate monitoring device, and acalorie-consumption monitoring device.
 6. A method as in claim 1,wherein the one or more sensor comprise two or more of a globalpositioning system (GPS) transceiver; a location determination device,an accelerometer sensor, a gyroscope, a compass, a heart-rate monitoringdevice, and a calorie-consumption monitoring device, and wherein thealgorithm uses as inputs data received from the two or more sensors. 7.A system comprising: one or more sensors generating sensor data relatingto a user of a digital content playback device; and computer hardwareconfigured to perform operations comprising: identifying that amodification to a current audio content item being supplied to the userby the digital content playback device is indicated; the identifyingcomprising applying an algorithm based on data from the one or moresensors; and making the modification to the current audio content item,wherein the algorithm comprises: determining a distance traveled by theuser over a measurement interval based on data from the one or moresensors, the measurement interval being sufficiently short to capture nomore than a single step; incrementing a step counter if the distancetraveled exceeds a threshold distance for classifying as the distancetraveled as a step; and determining a target beats per minute to whichthe current audio content item should be modified or maintained based ona duration of user movement and the step counter for a currentaggregation interval, the current aggregation interval aggregatingvalues from a plurality of measurement intervals including themeasurement interval.
 8. A system as in claim 7, wherein themodification comprises changing from the current audio content item to adifferent audio content item, the different audio content item having adifferent intensity criteria than the current audio content item.
 9. Asystem as in claim 8, wherein the different intensity criteria comprisesat least one of a different beats per minute, a different intensitylevel, and a different motivational level.
 10. A system as in claim 7,wherein the modification comprises: continuing to play the current audiocontent item; and changing from a current beats per minute of thecurrent audio content item to a different beats per minute by speedingup or slowing down the current beats per minute.
 11. A system as inclaim 7, wherein the one or more sensors comprise at least one of aglobal positioning system (GPS) transceiver; a location determinationdevice, an accelerometer sensor, a gyroscope, a compass, a heart-ratemonitoring device, and a calorie-consumption monitoring device.
 12. Asystem as in claim 11, wherein the computer hardware receives additionalsensor data from at least one additional sensor and the algorithm isapplied also based on the additional sensor data.
 13. A computer programproduct comprising a non-transitory machine-readable storage mediumstoring instructions that, when executed by at least one programmableprocessor, cause the at least one programmable processor to performoperations comprising: receiving sensor data generated by one or moresensors, the sensor data relating to a user of a digital contentplayback device; identifying that a modification to a current audiocontent item being supplied to the user by the digital content playbackdevice is indicated; the identifying comprising applying an algorithmbased on the sensor data; and making the modification to the currentaudio content item, wherein the algorithm comprises: determining adistance traveled by the user over a measurement interval based on datafrom the one or more sensors, the measurement interval beingsufficiently short to capture no more than a single step; incrementing astep counter if the distance traveled exceeds a threshold distance forclassifying as the distance traveled as a step; and determining a targetbeats per minute to which the current audio content item should bemodified or maintained based on a duration of user movement and the stepcounter for a current aggregation interval, the current aggregationinterval aggregating values from a plurality of measurement intervalsincluding the measurement interval.
 14. A computer program product as inclaim 13, wherein the modification comprises changing from the currentaudio content item to a different audio content item, the differentaudio content item having a different intensity criteria than thecurrent audio content item.
 15. A computer program product as in claim14, wherein the different intensity criteria comprises at least one of adifferent beats per minute, a different intensity level, and a differentmotivational level.
 16. A computer program product as in claim 13,wherein the modification comprises: continuing to play the current audiocontent item; and changing from a current beats per minute of thecurrent audio content item to a different beats per minute by speedingup or slowing down the current beats per minute.
 17. A computer programproduct as in claim 13, wherein the one or more sensors comprise atleast one of a global positioning system (GPS) transceiver; a locationdetermination device, an accelerometer sensor, a gyroscope, a compass, aheart-rate monitoring device, and a calorie-consumption monitoringdevice.
 18. A method as in claim 1, wherein the one or more sensorscomprise an accelerometer sensor.
 19. A system as in claim 7, whereinthe one or more sensors comprise an accelerometer sensor.
 20. A computerprogram product as in claim 13, wherein the one or more sensors comprisean accelerometer sensor.